1. The easiest way is to compare the feel, fake titanium dioxide is smoother, and real titanium dioxide is astringent.
2. Water flushing with titanium dioxide on your hands. The fake ones are easy to wash off, but it is really not easy to wash off.
3. Take a cup of water, throw the titanium dioxide into it, the ones that float up are true, and the ones that settle down are false (unless activated modified products are added).